sd101
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sd101 [2009/06/15 10:09] dmertz |
sd101 [2009/06/16 07:31] twdorris |
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| In calculating fuel requirements for an engine, the amount of air (n in the above equation) is the critical piece of data we need to solve for. To solve for that, we need to know absolute pressure, absolute temperature and volume. | In calculating fuel requirements for an engine, the amount of air (n in the above equation) is the critical piece of data we need to solve for. To solve for that, we need to know absolute pressure, absolute temperature and volume. | ||
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| ===== Pressure and Temperature ===== | ===== Pressure and Temperature ===== | ||
| - | Pressure and temperature are easy enough to measure in our application using off the shelf sensors like the GM IAT and/or the GM 3-bar sensor. Other pressure sensor options are listed on our [[externalsensorlist|Aftermarket Sensor List]]. These include the GM 3.3-bar, AEM 3.5-bar and AEM 5-bar sensors. Other sensors listed on that page can be logged, but are not suitable for SD operation because they do not provide a reliable **absolute** pressure reading. | + | Pressure and temperature are easy enough to measure in our application using off the shelf sensors like the GM IAT for temperature and the GM 3-bar sensor for pressure. Other pressure sensor options are listed on our [[externalsensorlist|Aftermarket Sensor List]]. These include the GM 3.3-bar, AEM 3.5-bar and AEM 5-bar sensors. Other sensors listed on that page can be logged, but are not suitable for SD operation because they do not provide a reliable **absolute** pressure reading. |
| For air temperature, the only supported sensor is the GM IAT sensor (AEM IAT sensor is actually the same thing). You can get part number information off the [[externalsensorlist|Aftermarket Sensor List]] page. | For air temperature, the only supported sensor is the GM IAT sensor (AEM IAT sensor is actually the same thing). You can get part number information off the [[externalsensorlist|Aftermarket Sensor List]] page. | ||
| - | When you connect these sensors to your ECU, note that you must connect the GM IAT sensor to the IAT input on the ECU. There is no other supported IAT input. For the pressure sensor, you can log that on any available (and compatible) input on the ECU. | + | When you connect these sensors to your ECU, note that you must connect the GM IAT sensor to the IAT input on the ECU. There is no other supported IAT input. For the pressure sensor, you can log that on any [[externalsensorinput|available (and compatible) input]] on the ECU. |
| Accuracy is important, particularly for the pressure readings. [[sdhose|The MAP sensor should be connected as intimately as practical to the intake manifold.]] Long, narrow hoses and tee fittings in the path to the sensor slow the response of the pressure sensor, resulting in poor airflow determination. The delayed pressure response will result in poor throttle response and poor control over air/fuel ratio whenever the intake manifold pressure changes. Since both sensors are referenced to the ECU's sensor ground circuit, it's also important that the ECU's sensor ground circuit isn't disrupted by having high-current devices attached to sensor ground. | Accuracy is important, particularly for the pressure readings. [[sdhose|The MAP sensor should be connected as intimately as practical to the intake manifold.]] Long, narrow hoses and tee fittings in the path to the sensor slow the response of the pressure sensor, resulting in poor airflow determination. The delayed pressure response will result in poor throttle response and poor control over air/fuel ratio whenever the intake manifold pressure changes. Since both sensors are referenced to the ECU's sensor ground circuit, it's also important that the ECU's sensor ground circuit isn't disrupted by having high-current devices attached to sensor ground. | ||
sd101.txt ยท Last modified: 2024/03/15 11:16 (external edit)
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